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Big-signal decomposition decoupling control method and device for buck-boost converter

A decoupling control and converter technology, applied in the field of power electronic converter control, can solve the problems of complex controller design of small signal modeling method, and achieve the effect of improving stability and eliminating cross-coupling

Active Publication Date: 2016-08-24
GUANGXI UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to provide a large-signal decomposition and decoupling control method and device of a buck-boost converter, thereby overcoming the limitations of the small-signal modeling method of the buck-boost converter and the coupling relationship of the buck-boost converter. Disadvantages of very complex controller design

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  • Big-signal decomposition decoupling control method and device for buck-boost converter

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Embodiment Construction

[0020] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0021] Throughout the specification and claims, unless expressly stated otherwise, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include stated elements and not to exclude other components.

[0022] figure 1 A schematic flow chart showing a large signal decomposition and decoupling control method for a buck-boost converter according to a preferred embodiment of the present invention is shown. like figure 1 As shown, the control method specifically includes:

[0023] S100: Decomposing the control system of the buck-boost converter into a disturbance part, a current-loop controlled object, and a voltage-loop controlled object to construct a large-signal c...

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Abstract

The invention discloses a big-signal decomposition decoupling control method and device for a buck-boost converter, and the method comprises the steps: enabling a converter system to be divided into a disturbance part, a current ring controlled object and a voltage ring controlled object, so as to build a big-signal circuit model of the converter; carrying out the feedforward decoupling of the disturbance part; carrying out the inverse system decoupling and linear feedback of the current ring controlled object, and compensating for the current ring controlled object as a pseudo linear system, wherein a compensated current ring open-loop transfer function is a one-order pure integration element; carrying out the inverse system decoupling and linear feedback of the voltage ring controlled object, and compensating for the voltage ring controlled object as a pseudo linear system, wherein a compensated voltage ring open-loop transfer function is a unit system. The method can achieve the independent control of the disturbance part, the current ring controlled object and the voltage ring controlled object, thereby enabling the disturbance control, voltage ring dynamic characteristic control and current ring dynamic characteristic control of the buck-boost converter to be independent processes, and achieving the decoupling control.

Description

technical field [0001] The invention relates to the technical field of power electronic converter control, in particular to a large-signal decomposition and decoupling control method and device for a buck-boost converter. Background technique [0002] Small-signal modeling of buck-boost converter and linear feedback control is a mature analysis and research method at present, but this method has the following limitations: (1) The product term of duty cycle and input voltage or state variable is ignored , so that the disturbance must be much smaller than the DC operating point; (2) In actual analysis, the disturbance of the DC power supply and load is usually ignored, and it is simplified to a single-input single-output system, resulting in a large margin for the designed controller, and also The working performance of the converter under large signal disturbance and wide range operation cannot be guaranteed. [0003] With the development of new energy distributed DC power s...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/1582H02M1/0019H02M1/0022
Inventor 陆益民朱海猛黄险峰
Owner GUANGXI UNIV
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